A dvanda compound of words of contrary significations, but not being the names of concrete substances.,
Thus शीतोष्णम् or शीतोष्णे 'cold and heat'; सुखदुःखं or सुखदुःखे 'pleasure and pain'; जीवितनरकं or जीवितनरके 'life and death.'
The word विप्रतिषिद्धं means words of contrary significations, च indicates the anuvritti of the word 'optionally' from the last sutra.
Why do we say 'of contrary significations'? Observe, कामक्रोधौ 'lust and anger,' which are not of contrary significations.
Why do we say 'not being the names of substances'? Observe शीतोष्णे उदके 'cold and warm waters,' which denote substances.,